Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
hoc thiet » hoc thieu, hoc thuyet, hoc hien
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
danh toan » manh toan, anh toan, dan toan
van manh » van minh, van anh, van hanh
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet hach - ((canh manh) or (van manh)) cua ((dang cong) or (dung cong)) danh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((canh manh) OR (van manh)) cua ((dang cong) OR (dung cong)) danh toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - ((canh manh) or (van manh)) cua ((dang cong) or (dung cong)) danh toan tap*.